feat(engine): per-repo heading alias closes the Non-goals/nb-repo gap

The Non-goals contract is one literal English heading, matched
case-insensitively but never translated — a repo whose readers were
declared `nb` in `locales` could only go green by planting an English
heading inside an otherwise-Norwegian document. Measured on
ki-produktivitetsmodell (order, census 09): `## Virkeområde og
forbehold` already does the job Non-goals exists for, HEADING-MISSING
fired anyway. `heading_aliases` in the register is the same shape
`titles` already is for the README H1 — decision in the repo,
bookkeeping here — keyed per repo so two nb-repos need not share a
Norwegian phrasing. Satisfying a requirement through it is its own OK
(HEADING-ALIAS), never folded silently into the aggregate.

Also books two operator title decisions verified against the live
clones (not the coord messages that reported them): .profile's H1
became "From AI to Chitta — open" (org landing page rebuild, commit
9898a6e), and ki-produktivitetsmodell's H1 "Tre nivå av organisatorisk
produktivitet med KI" is deliberate, not drift.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gh6T6iHHkMvgeBbGaLmLQD

CLAUDE.md

@@ -225,6 +225,21 @@ would recreate, in data, exactly the drift this plugin exists to remove.
   stands. What the gate must never do is make "we decided this" and "nobody
   looked" the same output. The wanted side effect is exposure, not silence —
   `ai-psychosis` is deliberately unregistered so it stands alone.
+- **A fixed-language contract has a blind spot the `titles` pattern already
+  knows how to close.** `## Non-goals` is one literal English string, matched
+  case-insensitively but not translated, so it cannot be satisfied by a repo
+  whose readers were declared `nb` in `locales` — the only way to go green was
+  planting an English heading inside an otherwise-Norwegian document. Measured
+  on `ki-produktivitetsmodell` (order, 2026-08-18, census 09 on that repo):
+  `nb` locale, `## Virkeområde og forbehold` already doing the job Non-goals
+  exists for (a stranger sees what the repo does not try to be), `HEADING-
+  MISSING` `ERROR` regardless. `heading_aliases` in the register is the same
+  shape `titles` already is for the H1 — the decision is taken in the repo, the
+  bookkeeping happens here — and satisfying a requirement through it is its own
+  `OK` (`HEADING-ALIAS`), never folded silently into the aggregate. Keyed PER
+  REPO, not per locale: a locale-wide translation table would force every
+  nb-repo into the same Norwegian phrasing for the same section, exactly the
+  constraint `titles` already rejects for H1s one requirement over.
 - **An exemption is a finding, not a deletion.** `readme_desc_match: false`
   turns off README-DESC equality for a class, and the check still emits an `OK`
   naming why. An exception nobody can see reads exactly like a check that